一种轻钢结构屋面系统的抗风极限分析  

A LIMIT WIND-RESISTANT ANALYSIS METHOD FOR ROOFING SYSTEM IN LIGHTWEIGHT STEEL STRUCTURES

作　　者：龚盈[1] 陈水福[1] 盛建康[1] 

机构地区：[1]浙江大学土木工程学系,杭州310058

出　　处：《低温建筑技术》2011年第2期5-7,18,共4页Low Temperature Architecture Technology

基　　金："十一五"国家科技支撑计划(2006BAJ03A02;2008BAJ08B14);国家自然科学基金(50978230)资助项目

摘　　要：在轻钢结构中,与屋面承重部分用螺栓连接、起防水作用的屋面柔性卷材是最易发生风致破坏的部件之一,要对其破坏模式进行有效预测,首先需确定卷材在风压作用下的挠曲变形。本文首先借助通用软件建立了一种三维(3-D)的有限元模型,用以模拟卷材的挠曲变形,并验证了该方法的有效性;在此基础上,提出了一种近似计算卷材最大挠度的理论公式方法,并给出了该理论公式在屋面系统抗风极限分析中的应用。In lightweight steel building structures, the flexible membranes which are mechanically attached to supporting members of roof system to achieve the waterproofing function are one of the most easily damaged components under wind loading. In order to effectively predict the actual failure mode of the roof membane, the curved deformation of the membrane should be first determined. This paper first presents a three-dimensional finite element （3D-FE） model for predicting membrane deformation and then validates it. On the basis, a simplified theoretical formula method is proposed to approximately predict the membrane deformation and the application of the formula in wind - resistant limit analyses for the roofing system is presented in the end.

关 键 词：极限分析 卷材变形 有限元模型 修正系数 

分 类 号：TU391[建筑科学—结构工程]